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In this updated edition of a worldwide bestseller, Giulia Enders reveals the secrets and science of the digestive system -- including new research on the connection between the gut and the brain. For too long, the gut has been the body's most ignored and least appreciated organ. But it does more than just dirty work; our gut is at the core of who we are. With quirky charm, science star and medical doctor Giulia Enders explains the gut's magic, answering questions like: Why does acid reflux happen? What's really up with gluten and lactose intolerance? How does the gut affect obesity and mood? A new section on the brain-gut axis dives into groundbreaking discoveries of psychobiotics - microbes with psychological effects that can influence conditions like depression and even stress.